Steam trap? Grease trap? moisture trap (drip leg)? Running trap? "P" trap? Drum trap. 1/2 S trap? sediment trap?

P-trap may be cracked, nuts are loose on p-trap, or check for leak above p-trap that may be dripping down on p-trap.

Who invented the p trap

Its called a P trap because if you stand the trap up and looked at it, its in the shape of the letter P

water trap, vapor trap, P trap,,,,,,,,,,,,,,, Plummers use all those, and everyone will know what you want. You need to know if its 1 1/4 or 1 1/2 inch.